Nevado Del Ruiz, Colombie :

Weekly bulletin of activity of the volcano Nevado del Ruiz, from 15 February to 22 February 2016The level of activity continue at level : Activity Level Amarillo or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of the Nevado del Ruiz, the Colombian Geological Service reports that:

During the last week, the volcanic system continued to show unstable behavior. The recorded seismic activity was mainly associated with rock fracturing in the volcanic structure. This type of seismicity was located mainly in the North distal sector (7.9 kilometers away from the crater) and, less numerous and scattered, in areas of the North, North East and South West of the Arenas crater. The depths of earthquakes during the week ranged from 0.6 to 7.9 km. The biggest event of the week was 2.9 ML (local magnitude), on February 17 at 5:22 p.m. (local time), located north of Arenas crater at a depth of 6.38 km.

It is considered thatthevolcanic systemcontinues to evolve.No new eventsthat may indicatean acceleration of theprocess, involvinggreater instabilityof itand therefore thechange in the levelof activityis present.Whilethe instability of thevolcanocoversmore than five years, it isessential not toget used to aseeminglymonotonousbehaviorof the volcano andmonitoring officialinformationto be published bytheColombianGeologicalService.

The activity thatis present on the volcanoesMomotombo, Santiago,MasayaandTelica,are maintainedwithin normal limitsand so fardo not represent anydanger to communitiesthat are located inthe surrounding areas.

« It is possible thatover time,in the short term,within days orweeks, whichis not alarmingand wasseen several timeson theTelicavolcano, magmais present in thecrater floorand maybea smalllava lakewill form,but does not representa great danger.Itis a system thatis openand in a sense, it is bestto be open,itavoidsthe increasing of the pressure.For theSan Cristobalvolcano, hesaid therewas noexplosion,butemissionsin small quantities,which whenaddedto the energyof the sun,producinga gaswhitecloudnot dangerous.« noseismic record, there isnothing unusualabout theSanCristobal« concludedSaballos.

Sources :Ineter , Sinapred.

Photos :Martin Rietze , Red de comunicadores ,

Sinabung , Indonésie :

3.17°N, 98.392°E
Elevation 2460 m

Dated on 02.26.2016, the Sinabung had an eruption that took place at 08.53 h.The flow is lowered over a distance of 3,000 m to the east–southeast, the ash plume rose to a height of 3000 m. The wind was to the west–southwest.The earthquake of emission lasted for 399 seconds.

Based on satellite images, ground reports, and information from PVMBG, the Darwin VAAC reported that during 18 and 20-23 February ash plumes from Sinabung rose to altitudes of 3-5.5 km (10,000-18,000 ft) a.s.l. and drifted as far as 55 km S, SW, W, and NW.

Sources : Pvmbg, GVP.

Photo : Endrolewa

Bulusan, Philippines :

BulletinFebruary 25, 20168:00.

This is a notice of increasing seismic activity of Bulusan Volcano. A total of forty-nine (49) volcanic earthquakes were recorded by the seismic monitoring network during the past 24 hours. The increased seismic activity may be precursory to minor steam-driven or phreatic eruptions occurring at the currently active west-northwest, northwest, southwest or summit vents, based on past behavior of the volcano. Steaming activity could not be observed due to thick clouds covering the summit.

Ash soars above Bulusan volcano after a recent blast. The Philippines’ Bulusan volcano spewed ash high above the south end of Luzon Island in a blast fueled by a buildup of steam inside the towering mountain. The four-minute eruption was the first since a blast last June produced a similar ash plume.

Precise leveling survey results from December 2-7, 2015 indicated slight inflationary changes of the volcano’s edifice relative to September 2015, consistent with ground deformation measurements from continuous GPS data since August 2015.